Measuring and testing – Volume or rate of flow – Thermal type
Patent
1982-08-18
1984-09-04
Myracle, Jerry W.
Measuring and testing
Volume or rate of flow
Thermal type
73118, G01F 168
Patent
active
044689632
ABSTRACT:
A method and apparatus are proposed for measuring the mass of a pulsating medium flowing in a flow cross section, in particular for measuring the aspirated air mass of internal combustion engines. The apparatus includes a temperature-dependent measuring resistor, the temperature and/or resistance of which is regulated in accordance with the mass of flowing medium. The measurement signal representing the medium mass is influenceable in accordance with the flow direction by at least one first temperature-dependent indication resistor, whose resistance value can be ascertained by a resistance measuring circuit and can be compared with the resistance value, also ascertained by a resistance measuring circuit, of a second temperature-dependent indication resistor. The first indication resistor and the second indication resistor are disposed on a carrier spaced apart from one another, and the difference between the two resistance values characterizes the flow direction, so that if there is a flow occurring counter to the desired flow direction, the measurement signal can be suppressed and incorrect measurement is prevented.
REFERENCES:
patent: 4403506 (1983-09-01), Lauterbach
patent: 4404846 (1983-09-01), Yamauchi et al.
Greigg Edwin E.
Myracle Jerry W.
Robert & Bosch GmbH
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